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采用自主研制的超低碳氮强化药芯焊丝,利用明弧摆动堆焊技术,选择合适的堆焊工艺参数,在42CrMo板表面堆焊形成马氏体不锈钢堆焊层。通过超声波探伤仪、金相显微镜、EDS、显微硬度计分析测试堆焊层的组织、成分及性能。结果表明,堆焊层无裂纹、气孔等缺陷,与母材达到了冶金结合;堆焊层组织为单一的马氏体,其成分与所设计的药芯一致;堆焊层的硬度从底部到表层呈梯度变化,其平均硬度是基体的2.5倍,弥补了传统堆焊材料整体韧性不足的缺陷;氮化物均匀弥散分布在堆焊层表面。
Using self-developed ultra-low carbon nitrogen flux-cored wire, using bright arc swing surfacing technology, select the appropriate surfacing process parameters, 42CrMo plate surface surfacing to form a martensitic stainless steel surfacing layer. The structure, composition and properties of overlay were tested by ultrasonic flaw detector, metallographic microscope, EDS and microhardness tester. The results show that the surfacing layer has no defects such as cracks and pores, and achieves metallurgical bonding with the parent metal. The surfacing layer is a single martensite with the same composition as the designed core. The hardness of the surfacing layer ranges from the bottom to Surface gradient changes, the average hardness of 2.5 times the matrix, to make up for the lack of overall toughness of the traditional surfacing materials defects; nitride evenly dispersed in the surfacing layer surface.